From 37a3884ee29823252d84c5abf1fa22f4e0f25508 Mon Sep 17 00:00:00 2001
From: Adam Harrison <adamdharrison@gmail.com>
Date: Sat, 5 Jun 2021 15:22:56 -0400
Subject: [PATCH] Initial commit of multicursor. Next step is to investigate
 how multicursor works on various other IDEs and ape those.

---
 data/core/commands/doc.lua | 245 +++++++++++++++++++++----------------
 data/core/doc/init.lua     | 124 +++++++++++++------
 data/core/docview.lua      |  69 +++++++----
 3 files changed, 270 insertions(+), 168 deletions(-)

diff --git a/data/core/commands/doc.lua b/data/core/commands/doc.lua
index c8c27509..ae67d5e1 100644
--- a/data/core/commands/doc.lua
+++ b/data/core/commands/doc.lua
@@ -24,13 +24,19 @@ local function get_indent_string()
 end
 
 
-local function doc_multiline_selection(sort)
-  local line1, col1, line2, col2, swap = doc():get_selection(sort)
-  if line2 > line1 and col2 == 1 then
-    line2 = line2 - 1
-    col2 = #doc().lines[line2]
+local function doc_multiline_selections(sort)
+  local iter = doc():get_selections(sort)
+  return function() 
+    local idx, line1, col1, line2, col2 = iter()
+    if not idx then
+      return
+    end
+    if line2 > line1 and col2 == 1 then
+      line2 = line2 - 1
+      col2 = #doc().lines[line2]
+    end
+    return idx, line1, col1, line2, col2
   end
-  return line1, col1, line2, col2, swap
 end
 
 local function append_line_if_last_line(line)
@@ -76,46 +82,51 @@ local commands = {
   end,
 
   ["doc:newline"] = function()
-    local line, col = doc():get_selection()
-    local indent = doc().lines[line]:match("^[\t ]*")
-    if col <= #indent then
-      indent = indent:sub(#indent + 2 - col)
+    for idx, line, col in doc():get_selections() do
+      local indent = doc().lines[line]:match("^[\t ]*")
+      if col <= #indent then
+        indent = indent:sub(#indent + 2 - col)
+      end
+      doc():text_input("\n" .. indent, idx)
     end
-    doc():text_input("\n" .. indent)
   end,
 
   ["doc:newline-below"] = function()
-    local line = doc():get_selection()
-    local indent = doc().lines[line]:match("^[\t ]*")
-    doc():insert(line, math.huge, "\n" .. indent)
-    doc():set_selection(line + 1, math.huge)
+    for idx, line in doc():get_selections() do
+      local indent = doc().lines[line]:match("^[\t ]*")
+      doc():insert(line, math.huge, "\n" .. indent)
+      doc():set_selections(idx, line + 1, math.huge)
+    end
   end,
 
   ["doc:newline-above"] = function()
-    local line = doc():get_selection()
-    local indent = doc().lines[line]:match("^[\t ]*")
-    doc():insert(line, 1, indent .. "\n")
-    doc():set_selection(line, math.huge)
+    for idx, line in doc():get_selections() do
+      local indent = doc().lines[line]:match("^[\t ]*")
+      doc():insert(line, 1, indent .. "\n")
+      doc():set_selections(idx, line, math.huge)
+    end
   end,
 
   ["doc:delete"] = function()
-    local line, col = doc():get_selection()
-    if not doc():has_selection() and doc().lines[line]:find("^%s*$", col) then
-      doc():remove(line, col, line, math.huge)
+    for idx, line, col in doc():get_selections() do
+      if not doc():has_selection(idx) and doc().lines[line]:find("^%s*$", col) then
+        doc():remove(line, col, line, math.huge)
+      end
+      doc():delete_to(idx, translate.next_char)
     end
-    doc():delete_to(translate.next_char)
   end,
 
   ["doc:backspace"] = function()
-    local line, col = doc():get_selection()
-    if not doc():has_selection() then
-      local text = doc():get_text(line, 1, line, col)
-      if #text >= config.indent_size and text:find("^ *$") then
-        doc():delete_to(0, -config.indent_size)
-        return
+    for idx, line, col in doc():get_selections() do
+      if not doc():has_selection(idx) then
+        local text = doc():get_text(line, 1, line, col)
+        if #text >= config.indent_size and text:find("^ *$") then
+          doc():delete_to(idx, 0, -config.indent_size)
+          return
+        end
       end
+      doc():delete_to(idx, translate.previous_char)
     end
-    doc():delete_to(translate.previous_char)
   end,
 
   ["doc:select-all"] = function()
@@ -128,75 +139,92 @@ local commands = {
   end,
 
   ["doc:select-lines"] = function()
-    local line1, _, line2, _, swap = doc():get_selection(true)
-    append_line_if_last_line(line2)
-    doc():set_selection(line1, 1, line2 + 1, 1, swap)
+    for idx, line1, _, line2 in doc():get_selections(true) do
+      append_line_if_last_line(line2)
+      doc():set_selections(idx, line1, 1, line2 + 1, 1, swap)
+    end
   end,
 
   ["doc:select-word"] = function()
-    local line1, col1 = doc():get_selection(true)
-    local line1, col1 = translate.start_of_word(doc(), line1, col1)
-    local line2, col2 = translate.end_of_word(doc(), line1, col1)
-    doc():set_selection(line2, col2, line1, col1)
+    for idx, line1, col1 in doc():get_selections(true) do
+      local line1, col1 = translate.start_of_word(doc(), line1, col1)
+      local line2, col2 = translate.end_of_word(doc(), line1, col1)
+      doc():set_selections(idx, line2, col2, line1, col1)
+    end
   end,
 
   ["doc:join-lines"] = function()
-    local line1, _, line2 = doc():get_selection(true)
-    if line1 == line2 then line2 = line2 + 1 end
-    local text = doc():get_text(line1, 1, line2, math.huge)
-    text = text:gsub("(.-)\n[\t ]*", function(x)
-      return x:find("^%s*$") and x or x .. " "
-    end)
-    doc():insert(line1, 1, text)
-    doc():remove(line1, #text + 1, line2, math.huge)
-    if doc():has_selection() then
-      doc():set_selection(line1, math.huge)
+    for idx, line1, _, line2 in doc():get_selections(true) do
+      if line1 == line2 then line2 = line2 + 1 end
+      local text = doc():get_text(line1, 1, line2, math.huge)
+      text = text:gsub("(.-)\n[\t ]*", function(x)
+        return x:find("^%s*$") and x or x .. " "
+      end)
+      doc():insert(line1, 1, text)
+      doc():remove(line1, #text + 1, line2, math.huge)
+      if doc():has_selection(idx) then
+        doc():set_selections(idx, line1, math.huge)
+      end
     end
   end,
 
   ["doc:indent"] = function()
-    doc():indent_text(false, doc_multiline_selection(true))
+    for idx, line1, col1, line2, col2 in doc_multiline_selections(true) do
+      local l1, c1, l2, c2 = doc():indent_text(false, line1, col1, line2, col2)
+      if not l1 then
+        doc():set_selections(idx, l1, c1, l2, c2)
+      end
+    end
   end,
 
   ["doc:unindent"] = function()
-    doc():indent_text(true, doc_multiline_selection(true))
+    for idx, line1, col1, line2, col2 in doc_multiline_selections(true) do
+      local l1, c1, l2, c2 = doc():indent_text(true, line1, col1, line2, col2)
+      if not l1 then
+        doc():set_selections(idx, l1, c1, l2, c2)
+      end
+    end
   end,
 
   ["doc:duplicate-lines"] = function()
-    local line1, col1, line2, col2, swap = doc_multiline_selection(true)
-    append_line_if_last_line(line2)
-    local text = doc():get_text(line1, 1, line2 + 1, 1)
-    doc():insert(line2 + 1, 1, text)
-    local n = line2 - line1 + 1
-    doc():set_selection(line1 + n, col1, line2 + n, col2, swap)
+    for idx, line1, col1, line2, col2 in doc_multiline_selections(true) do
+      append_line_if_last_line(line2)
+      local text = doc():get_text(line1, 1, line2 + 1, 1)
+      doc():insert(line2 + 1, 1, text)
+      local n = line2 - line1 + 1
+      doc():set_selections(idx, line1 + n, col1, line2 + n, col2, swap)
+    end
   end,
 
   ["doc:delete-lines"] = function()
-    local line1, col1, line2 = doc_multiline_selection(true)
-    append_line_if_last_line(line2)
-    doc():remove(line1, 1, line2 + 1, 1)
-    doc():set_selection(line1, col1)
+    for idx, line1, col1, line2, col2 in doc_multiline_selections(true) do
+      append_line_if_last_line(line2)
+      doc():remove(line1, 1, line2 + 1, 1)
+      doc():set_selections(idx, line1, col1)
+    end
   end,
 
   ["doc:move-lines-up"] = function()
-    local line1, col1, line2, col2, swap = doc_multiline_selection(true)
-    append_line_if_last_line(line2)
-    if line1 > 1 then
-      local text = doc().lines[line1 - 1]
-      doc():insert(line2 + 1, 1, text)
-      doc():remove(line1 - 1, 1, line1, 1)
-      doc():set_selection(line1 - 1, col1, line2 - 1, col2, swap)
+    for idx, line1, col1, line2, col2 in doc_multiline_selections(true) do
+      append_line_if_last_line(line2)
+      if line1 > 1 then
+        local text = doc().lines[line1 - 1]
+        doc():insert(line2 + 1, 1, text)
+        doc():remove(line1 - 1, 1, line1, 1)
+        doc():set_selections(idx, line1 - 1, col1, line2 - 1, col2)
+      end
     end
   end,
 
   ["doc:move-lines-down"] = function()
-    local line1, col1, line2, col2, swap = doc_multiline_selection(true)
-    append_line_if_last_line(line2 + 1)
-    if line2 < #doc().lines then
-      local text = doc().lines[line2 + 1]
-      doc():remove(line2 + 1, 1, line2 + 2, 1)
-      doc():insert(line1, 1, text)
-      doc():set_selection(line1 + 1, col1, line2 + 1, col2, swap)
+    for idx, line1, col1, line2, col2 in doc_multiline_selections(true) do
+      append_line_if_last_line(line2 + 1)
+      if line2 < #doc().lines then
+        local text = doc().lines[line2 + 1]
+        doc():remove(line2 + 1, 1, line2 + 2, 1)
+        doc():insert(line1, 1, text)
+        doc():set_selections(idx, line1 + 1, col1, line2 + 1, col2)
+      end
     end
   end,
 
@@ -205,28 +233,29 @@ local commands = {
     if not comment then return end
     local indentation = get_indent_string()
     local comment_text = comment .. " "
-    local line1, _, line2 = doc_multiline_selection(true)
-    local uncomment = true
-    local start_offset = math.huge
-    for line = line1, line2 do
-      local text = doc().lines[line]
-      local s = text:find("%S")
-      local cs, ce = text:find(comment_text, s, true)
-      if s and cs ~= s then
-        uncomment = false
-        start_offset = math.min(start_offset, s)
-      end
-    end
-    for line = line1, line2 do
-      local text = doc().lines[line]
-      local s = text:find("%S")
-      if uncomment then
+    for idx, line1, _, line2 in doc_multiline_selections(true) do
+      local uncomment = true
+      local start_offset = math.huge
+      for line = line1, line2 do
+        local text = doc().lines[line]
+        local s = text:find("%S")
         local cs, ce = text:find(comment_text, s, true)
-        if ce then
-          doc():remove(line, cs, line, ce + 1)
+        if s and cs ~= s then
+          uncomment = false
+          start_offset = math.min(start_offset, s)
+        end
+      end
+      for line = line1, line2 do
+        local text = doc().lines[line]
+        local s = text:find("%S")
+        if uncomment then
+          local cs, ce = text:find(comment_text, s, true)
+          if ce then
+            doc():remove(line, cs, line, ce + 1)
+          end
+        elseif s then
+          doc():insert(line, start_offset, comment_text)
         end
-      elseif s then
-        doc():insert(line, start_offset, comment_text)
       end
     end
   end,
@@ -350,26 +379,30 @@ local translations = {
 }
 
 for name, fn in pairs(translations) do
-  commands["doc:move-to-" .. name] = function() doc():move_to(fn, dv()) end
-  commands["doc:select-to-" .. name] = function() doc():select_to(fn, dv()) end
-  commands["doc:delete-to-" .. name] = function() doc():delete_to(fn, dv()) end
+  commands["doc:move-to-" .. name] = function() doc():move_to(nil, fn, dv()) end
+  commands["doc:select-to-" .. name] = function() doc():select_to(nil, fn, dv()) end
+  commands["doc:delete-to-" .. name] = function() doc():delete_to(nil, fn, dv()) end
 end
 
 commands["doc:move-to-previous-char"] = function()
-  if doc():has_selection() then
-    local line, col = doc():get_selection(true)
-    doc():set_selection(line, col)
-  else
-    doc():move_to(translate.previous_char)
+  for idx, line, col in doc():get_selections(true) do
+    if doc():has_selection(idx) then
+      doc():set_selections(idx, line, col)
+    end
+  end
+  if not doc():has_selection() then
+    doc():move_to(nil, translate.previous_char)
   end
 end
 
 commands["doc:move-to-next-char"] = function()
-  if doc():has_selection() then
-    local _, _, line, col = doc():get_selection(true)
-    doc():set_selection(line, col)
-  else
-    doc():move_to(translate.next_char)
+  for idx, _, _, line, col in doc():get_selections(true) do
+    if doc():has_selection(idx) then
+      doc():set_selections(idx, line, col)
+    end
+  end
+  if not doc():has_selection() then
+    doc():move_to(nil, translate.next_char)
   end
 end
 
diff --git a/data/core/doc/init.lua b/data/core/doc/init.lua
index 88f63a68..63a4225b 100644
--- a/data/core/doc/init.lua
+++ b/data/core/doc/init.lua
@@ -46,7 +46,7 @@ end
 
 function Doc:reset()
   self.lines = { "\n" }
-  self.selection = { a = { line=1, col=1 }, b = { line=1, col=1 } }
+  self.selections = { 1, 1, 1, 1 }
   self.undo_stack = { idx = 1 }
   self.redo_stack = { idx = 1 }
   self.clean_change_id = 1
@@ -131,9 +131,20 @@ function Doc:set_selection(line1, col1, line2, col2, swap)
   assert(not line2 == not col2, "expected 2 or 4 arguments")
   if swap then line1, col1, line2, col2 = line2, col2, line1, col1 end
   line1, col1 = self:sanitize_position(line1, col1)
+  line2, col2 = self:sanitize_position(line2 or line1, col2 or col1) 
+  self.selections = { line1, col1, line2, col2 }
+end
+
+function Doc:set_selections(idx, line1, col1, line2, col2, swap)
+  assert(not line2 == not col2, "expected 3 or 5 arguments")
+  if swap then line1, col1, line2, col2 = line2, col2, line1, col1 end
+  line1, col1 = self:sanitize_position(line1, col1)
   line2, col2 = self:sanitize_position(line2 or line1, col2 or col1)
-  self.selection.a.line, self.selection.a.col = line1, col1
-  self.selection.b.line, self.selection.b.col = line2, col2
+  local target = (idx - 1)*4 + 1
+  self.selections[target] = line1
+  self.selections[target+1] = col1
+  self.selections[target+2] = line2
+  self.selections[target+3] = col2
 end
 
 
@@ -147,22 +158,53 @@ end
 
 
 function Doc:get_selection(sort)
-  local a, b = self.selection.a, self.selection.b
   if sort then
-    return sort_positions(a.line, a.col, b.line, b.col)
+    return sort_positions(self.selections[1], self.selections[2], self.selections[3], self.selections[4])
+  end
+  return self.selections[1], self.selections[2], self.selections[3], self.selections[4]
+end
+
+function Doc:get_selection_count()
+  return #self.selections / 4
+end
+
+function Doc:get_selections(sort)
+  local idx = 1
+  return function()
+    if idx >= #self.selections then
+      return
+    end
+    idx = idx + 4
+    if sort then
+      return ((idx - 5) / 4) + 1, sort_positions(self.selections[idx - 4], self.selections[idx - 3], self.selections[idx - 2], self.selections[idx - 1])
+    else
+      return ((idx - 5) / 4) + 1, self.selections[idx - 4], self.selections[idx - 3], self.selections[idx - 2], self.selections[idx - 1]
+    end
   end
-  return a.line, a.col, b.line, b.col
 end
 
 
-function Doc:has_selection()
-  local a, b = self.selection.a, self.selection.b
-  return not (a.line == b.line and a.col == b.col)
+function Doc:has_selection(idx)
+  if idx then
+    local target = (idx-1)*4+1
+    return 
+      self.selections[target] ~= self.selections[target+2] or
+      self.selections[target+1] ~= self.selections[target+3]
+  end
+  for target = 1, #self.selections, 4 do
+    if self.selections[target] ~= self.selections[target+2] or
+      self.selections[target+1] ~= self.selections[target+3] then
+      return true
+    end
+  end
+  return false
 end
 
 
 function Doc:sanitize_selection()
-  self:set_selection(self:get_selection())
+  for idx, line1, col1, line2, col2 in self:get_selections() do
+    self:set_selections(idx, line1, col1, line2, col2)
+  end
 end
 
 
@@ -348,13 +390,16 @@ function Doc:redo()
 end
 
 
-function Doc:text_input(text)
-  if self:has_selection() then
-    self:delete_to()
+function Doc:text_input(text, idx)
+  for sidx, line, col in self:get_selections() do
+    if not idx or idx == sidx then
+      if self:has_selection(sidx) then
+        self:delete_to(sidx)
+      end
+      self:insert(line, col, text)
+      self:move_to(sidx, #text)
+    end
   end
-  local line, col = self:get_selection()
-  self:insert(line, col, text)
-  self:move_to(#text)
 end
 
 
@@ -380,29 +425,38 @@ function Doc:replace(fn)
 end
 
 
-function Doc:delete_to(...)
-  local line, col = self:get_selection(true)
-  if self:has_selection() then
-    self:remove(self:get_selection())
-  else
-    local line2, col2 = self:position_offset(line, col, ...)
-    self:remove(line, col, line2, col2)
-    line, col = sort_positions(line, col, line2, col2)
+function Doc:delete_to(idx, ...)
+  for sidx, line1, col1, line2, col2 in self:get_selections(true) do
+    if not idx or sidx == idx then
+      if self:has_selection(sidx) then
+        self:remove(line1, col1, line2, col2)
+      else
+        local l2, c2 = self:position_offset(line, col, ...)
+        self:remove(line1, col1, l2, c2)
+        line1, col1 = sort_positions(line1, col1, l2, c2)
+      end
+      self:set_selections(sidx, line1, col1)
+    end
   end
-  self:set_selection(line, col)
 end
 
 
-function Doc:move_to(...)
-  local line, col = self:get_selection()
-  self:set_selection(self:position_offset(line, col, ...))
+function Doc:move_to(idx, ...)
+  for sidx, line, col in self:get_selections() do
+    if not idx or sidx == idx then
+      self:set_selections(sidx, self:position_offset(line, col, ...))
+    end
+  end
 end
 
 
-function Doc:select_to(...)
-  local line, col, line2, col2 = self:get_selection()
-  line, col = self:position_offset(line, col, ...)
-  self:set_selection(line, col, line2, col2)
+function Doc:select_to(idx, ...)
+  for sidx, line, col, line2, col2 in self:get_selections() do
+    if not idx or idx == sidx then
+      line, col = self:position_offset(line, col, ...)
+      self:set_selections(sidx, line, col, line2, col2)
+    end
+  end
 end
 
 
@@ -439,7 +493,7 @@ end
 --   inserts the appropriate whitespace, as if you typed them normally.
 -- * if you are unindenting, the cursor will jump to the start of the line,
 --   and remove the appropriate amount of spaces (or a tab).
-function Doc:indent_text(unindent, line1, col1, line2, col2, swap)
+function Doc:indent_text(unindent, line1, col1, line2, col2)
   local text = get_indent_string()
   local _, se = self.lines[line1]:find("^[ \t]+")
   local in_beginning_whitespace = col1 == 1 or (se and col1 <= se + 1)
@@ -455,9 +509,9 @@ function Doc:indent_text(unindent, line1, col1, line2, col2, swap)
     l1d, l2d = #self.lines[line1] - l1d, #self.lines[line2] - l2d
     if (unindent or in_beginning_whitespace) and not self:has_selection() then
       local start_cursor = (se and se + 1 or 1) + l1d or #(self.lines[line1])
-      self:set_selection(line1, start_cursor, line2, start_cursor, swap)
+      return line1, start_cursor, line2, start_cursor
     else
-      self:set_selection(line1, col1 + l1d, line2, col2 + l2d, swap)
+      return line1, col1 + l1d, line2, col2 + l2d
     end
   else
     self:text_input(text)
diff --git a/data/core/docview.lua b/data/core/docview.lua
index 070ee0c4..edde4c55 100644
--- a/data/core/docview.lua
+++ b/data/core/docview.lua
@@ -276,7 +276,18 @@ function DocView:on_mouse_moved(x, y, ...)
     local l1, c1 = self:resolve_screen_position(x, y)
     local l2, c2 = table.unpack(self.mouse_selecting)
     local clicks = self.mouse_selecting.clicks
-    self.doc:set_selection(mouse_selection(self.doc, clicks, l1, c1, l2, c2))
+    if keymap.modkeys["ctrl"] then
+      if l1 > l2 then
+        l2 = l1
+      end
+      local idx = 1
+      for i = l1, l2 do
+        idx = idx + 1
+        self.doc:set_selections(idx, i, math.min(c1, #self.doc.lines[i]), i, math.min(c1, #self.doc.lines[i]))
+      end
+    else
+      self.doc:set_selection(mouse_selection(self.doc, clicks, l1, c1, l2, c2))
+    end
   end
 end
 
@@ -340,46 +351,50 @@ end
 
 
 function DocView:draw_line_body(idx, x, y)
-  local line, col = self.doc:get_selection()
-
   -- draw selection if it overlaps this line
-  local line1, col1, line2, col2 = self.doc:get_selection(true)
-  if idx >= line1 and idx <= line2 then
-    local text = self.doc.lines[idx]
-    if line1 ~= idx then col1 = 1 end
-    if line2 ~= idx then col2 = #text + 1 end
-    local x1 = x + self:get_col_x_offset(idx, col1)
-    local x2 = x + self:get_col_x_offset(idx, col2)
-    local lh = self:get_line_height()
-    renderer.draw_rect(x1, y, x2 - x1, lh, style.selection)
+  for lidx, line1, col1, line2, col2 in self.doc:get_selections(true) do 
+    if idx >= line1 and idx <= line2 then
+      local text = self.doc.lines[idx]
+      if line1 ~= idx then col1 = 1 end
+      if line2 ~= idx then col2 = #text + 1 end
+      local x1 = x + self:get_col_x_offset(idx, col1)
+      local x2 = x + self:get_col_x_offset(idx, col2)
+      local lh = self:get_line_height()
+      renderer.draw_rect(x1, y, x2 - x1, lh, style.selection)
+    end
   end
-
-  -- draw line highlight if caret is on this line
-  if config.highlight_current_line and not self.doc:has_selection()
-  and line == idx and core.active_view == self then
-    self:draw_line_highlight(x + self.scroll.x, y)
+  for lidx, line1, col1, line2, col2 in self.doc:get_selections(true) do 
+    -- draw line highlight if caret is on this line
+    if config.highlight_current_line and not self.doc:has_selection(lidx)
+    and line1 == idx and core.active_view == self then
+      self:draw_line_highlight(x + self.scroll.x, y)
+    end
   end
-
+  
   -- draw line's text
   self:draw_line_text(idx, x, y)
 
   -- draw caret if it overlaps this line
   local T = config.blink_period
-  if line == idx and core.active_view == self
-  and (core.blink_timer - core.blink_start) % T < T / 2
-  and system.window_has_focus() then
-    local lh = self:get_line_height()
-    local x1 = x + self:get_col_x_offset(line, col)
-    renderer.draw_rect(x1, y, style.caret_width, lh, style.caret)
+  for _, line, col in self.doc:get_selections() do 
+    if line == idx and core.active_view == self
+    and (core.blink_timer - core.blink_start) % T < T / 2
+    and system.window_has_focus() then
+      local lh = self:get_line_height()
+      local x1 = x + self:get_col_x_offset(line, col)
+      renderer.draw_rect(x1, y, style.caret_width, lh, style.caret)
+    end
   end
 end
 
 
 function DocView:draw_line_gutter(idx, x, y)
   local color = style.line_number
-  local line1, _, line2, _ = self.doc:get_selection(true)
-  if idx >= line1 and idx <= line2 then
-    color = style.line_number2
+  for _, line1, _, line2 in self.doc:get_selections(true) do 
+    if idx >= line1 and idx <= line2 then
+      color = style.line_number2
+      break
+    end
   end
   local yoffset = self:get_line_text_y_offset()
   x = x + style.padding.x